Breech mechanism for small-arms.



H. BOROHARDT.

BREEGH MECHANISM FOR SMALL ARMS.

APPLICATION FILED JULY 30. 1907.

9 L 2 (M mm 5 mm D a Q Q Q @i m w w/ T/VES 858. I

APPLICATION TILED JULYSO. 1907.

Patented Apr. 20, 1909.

2 SHEETS-SHEET 2.

WITNESSES;

SEAS

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PATENT enrich.

BBEECH MECHANISM FOR MALL-ARMS.

Specification of Letters Patent.

Patented April 20, 1909.

, Application filed July 80, 1907. Serial No. 386,210.

the following is afull, clear, and exact de-v scri tion.

he present invention refers to a tog le joint breechmecham'sm for automatic re armswith fixed barrels, and the object of the invention is, to obtain a new mechanical method for breaking the toggle joint. For this purpose a swinging counter support, pivoted to the end journal of the toggle oint 1s interposed and placed at such an ang e as to make it give away in the opening direction wlhen pressure is brought to act upon the tog es. g According to the form of construction shown in Figures 1 and 2 the counter sup ort (bearing) 0 is provided with an arm, w ich serves as a carrier for the link b of the to -gle joint a b, which is pivoted thereto. rho swingin motion of the counter support 0 is limited y stops and imparts a short initial breaking movement to the to gle joint. Even though the movement of t e counter support 0 resultin from the gas pressure u on the base of t e cartridge case breechb ock and toggle joint is but slight, it nevertheless imparts sufficient kinetic energy to the toggle joint to fully open the breech mechanism and place a spring under tension,

which acting upon the toggle joint again closes the breech. The counter support can be arranged to act either upon the front or upon the rear link of the toggle joint.

Figs. 3 and 4 show a construction in which the breech block 7:: by having a slight vertical play at k is made to answer as -movable counter support to the forward link. Applying this arrangement the head of the cartridge case becomes slightly deformed, which however does not occasion any obstruction or inconvenience.

What I claim as my invention, and desire to secure by Patent is:

1. In a fire arm, a breech mechanism having a toggle joint and means for giving such toggle joint a small initial breaking movementwhen the cartridge is fired, whereby such to gle is thrown out of its locking position and is enabled to easily fold, said means comprising a movable counter support pivoted to one of the members of the toggle and adapted to throw such toggle away from the locking position when the breech block is presses ackwardly.

2. In a fire arm, a breech mechanism having a toggle joint and means for giving such toggle joint a small initial breaking movement when the cartridge is fired, whereby such to gle is thrown out of its locking'position an is enabled to easily fold, said means comprising a breech block pivoted to one of the members of said toggle, said breech block having a sh ht vertical play, whereby it is tilted to a slig t extent so that it throws said toggle away from the locking position.

In witness whereof, I have hereunto si ned my name in the presence of twosubscriliing.

witnesses.

HUGO BORCHARD'I.

Witnesses HENRY HASPER, WoLnnMAR HAUPT. 

